@RameshParab Duryodhana now knows that Drupad in all probability will employ Chakravyuh and if pandavas goes first then Arjun will destroy it and pandavas will emerge victorious. So this will result in the defeat of Kauravas even without participating in it. So his best chance is to go first and attempt to destroy chakravyuh and capture Drupad.
@Pantheraleo123 Karna has made some plans to save Subhadra from Arjun by showing her true face of Arjun and Pandavas as well as Kunti with the help of Haldhar Balram. Haldhar Balram loves Subhadra more than himself. So, obviously he will save Subhadra from Arjun